This is the cooling plenum that will be fitted along ceiling to provide air and lighting.

This is a dam to prevent water coming forward from the plenum NACA.  The Plenum NACA is between the engine cooling NACAs.

These are for the LED lighting which will be in the cooling duct.

Nutplates for the LED lighting.

LED Lighting.

Air vents.

I installed a removable front piece for future addition of a forward LED light.

Drain hole and tube (aft of the dam for water to drain from the plenum).

Drain tube bonded in with micro balloon slurry.

Completed plenum showing a LED light holder and air vent.